AK4634EN Datasheet, PDF (53/94 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK -AMP

[AK4634]
■ Speaker Output
AK4634 has a Mono Class-D Speaker-Amp. Power supply for Speaker-Amp(SVDD) can be set from 2.2V up to 4.0V.
The Speaker is mono and BTL output, and can drive dynamic speaker and piezo speaker without LPF (filter-less). This
speaker can output 400W@8Ω at SVDD = 3.3V, SPKG bit = “0”. This gain is set by SPKG bit (Table 37). The output level
of speaker amp is depended on voltage of SVDD and SPKG bit.
SPKG bit
Gain
0
0dB
1
+2dB (Note 34)
Note 34. The signals more than -2dBFS clip.
Table 37. SPK- Amp Gain
The power up/down speaker amp is controlled by PMSPK bit. When PMSPK bit is “0”, the SPP and SPN pins output
VSS3 level. ON/OFF of the speaker amp output is controlled by SPOUTE bit. When SPOUTE bit is “0”, the SPP and SPN
pins are in VSS3-state forcibly. When outputting from the DAC to the speaker, PMDAC bit should be set to “1”.
Follow the following sequence.
PMSPK bit
SPOUTE bit
SPP pin
SPN pin
Normal Output
Normal Output
Figure 43. Power-up/Power-down Timing for Speaker-Amp
MS0686-E-03
- 53 -
2014/10